Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) IWAKUMA Akihiro and NARAHASHI Tomonaga and KITAHARA Go and OHKUBO Masahito and KAMIMURA Shunichi,Efficacy of Intravaginal Progesterone Administration as an Additional Treatment on Two Types of Timed AI Protocols in a Commercial Herd of Holstein Heifers,Journal of Veterinary Medical Science,0916-7250,JAPANESE SOCIETY OF VETERINARY SCIENCE,2008,70,3,243-249,https://cir.nii.ac.jp/crid/1390001206428008832,https://doi.org/10.1292/jvms.70.243